Article
Geochemistry & Geophysics
Yongchao Liu, Christian Schmidt, Jiankang Li
Summary: In this study, fluid inclusions in pegmatite minerals were analyzed using Raman spectroscopy. It was found that the aqueous liquid and vapor phases contained a high amount of carbon dioxide, and occasionally methane was detected in the vapor. HCO3- ions were identified in the fluid inclusions in tantalite-(Mn) from the Morrua Mine and in late-stage quartz from the Muiane pegmatite and the Naipa Mine, suggesting the involvement of hydrogen carbonate-rich fluids in the evolution of peraluminous granitic pegmatites.
AMERICAN MINERALOGIST
(2022)
Article
Geochemistry & Geophysics
Li Zhang, Xuan Guo, Wan-Cai Li, Jiale Ding, Bobo Bai, Huaiwei Ni
Summary: The diffusion behavior of silver in granitic melts was studied under various conditions, revealing that silver solubility increases with temperature, diffusivity increases with temperature and water content, but decreases with pressure. The study also showed that the diffusion of silver in melt is relatively rapid compared to other species, suggesting it is not a rate-limiting step for silver enrichment into exsolved fluid bubbles or sulfide blobs.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Jing Fang, Andreas Audetat
Summary: In order to better understand the distribution behavior of molybdenum (Mo) during the crystallization of granitic magmas in the upper crust, researchers experimentally determined the partition coefficients of Mo between aqueous fluids and granitic melts. The results showed that the confining pressure exerted a significant effect on the evolution of Mo concentration in the residual melt during fractional crystallization, with deeper crystallizing magmas exhibiting higher Mo extraction efficiency.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Junyu Li, Shuyun Cao, Xuemei Cheng, Lei Jin, Meixia Lyu
Summary: Granitic pegmatites formed along the Ailao Shan-Red River shear zone (ASRR-SZ) in Southeast Asia at 28-23 Ma during left-lateral shearing. They are characterized by high SiO2 (65.6%-76.2%), moderate K2O (2.6%-7.4%), low MgO (0.1%-0.3%), and high differentiation index (DI = 82.4-95.3). Zircon geochemistry suggests a crustal origin, and the pegmatites formed during transpressional deformation with temperatures around 621-860℃ and fluid trapping temperatures of 180-350℃.
Article
Geochemistry & Geophysics
Jun-Lin Wang, Hai-Zhen Wei, M. R. Palmer, A. E. Williams-Jones, Jing Ma, Shao-Yong Jiang, Simon V. Hohl, Yuan-Feng Zhu, Chun Huan, Miao-Miao Zhang, Jian-Jun Lu
Summary: The geochemistry of Ba plays a significant role in studying igneous processes and fluid-melt interaction. Understanding Ba isotope fractionation mechanisms is crucial for fully utilizing its potential.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geology
Jiankang Li, Qinggao Yan, Peng Li, Mark Ivan Jacobson
Summary: Granitic pegmatites are coarse-to-gigantic-sized igneous rocks that are the main source of rare metals and gem resources. Their formation is linked to plate movements and crustal growth during orogeny. Through the study of isotopic ages and compositions in Chinese granite-pegmatite fields, the formation patterns and controlling factors during orogeny were examined, revealing changes in pegmatite types and associations with different orogenies. The understanding of metasediments within orogenies and their connection to pegmatite formation contributes to the identification of potential prospecting areas for rare metal deposits.
ORE GEOLOGY REVIEWS
(2023)
Article
Geochemistry & Geophysics
Yabin Yuan, Lowell R. Moore, Ryan J. McAleer, Shunda Yuan, Hegen Ouyang, Harvey E. Belkin, Jingwen Mao, D. Matthew Sublett, Robert J. Bodnar
Summary: The Taishanmiao granitic batholith in Henan Province, China contains numerous small bodies of simple quartz and alkali feldspar pegmatites. Analysis and modeling suggest that the pegmatites formed through continuous fractional crystallization of the granitic magma, with a mineral assemblage similar to that of the pegmatites and residual melt composition similar to homogenized melt inclusions. The closed system, isochoric model proposes that the pegmatites began forming after most of the granitic melt had crystallized, with fluctuating pressure conditions leading to the formation of pegmatitic textures.
AMERICAN MINERALOGIST
(2021)
Article
Geochemistry & Geophysics
Yuka Taniwaki, Kazuya Shimooka, Satoshi Saito
Summary: In this study, a new approach is proposed to estimate the crystallization pressures of granitoid magmas using melt inclusions in zircon. Homogenization experiments of polymineralic inclusions hosted in zircon have been conducted to obtain the homogenized compositions, which can represent the fractionated interstitial melts trapped in growing zircon crystals. The results provide valuable data for understanding granite petrogenesis and the tectonic evolution of orogenic belts.
Article
Geosciences, Multidisciplinary
Dalton M. McCaffrey, Simon M. Jowitt
Summary: This study investigates the influence of crystallization temperature and undercooling on critical metal mineralization in granitic pegmatite deposits. The analysis of a global compilation of naturally-measured crystallization temperatures reveals that large degrees of undercooling are necessary for critical metal mineralization. Different pegmatite families and associated commodities require different petrogenetic processes, and internal pegmatite zoning can be explained by variability in the degree of undercooling.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Zheng-Hang Lv, Hui Zhang, Yong Tang
Summary: This study analyzes the geology, mineralogy, zircon U-Pb chronology, and Hf isotope geochemistry of 10 Permian pegmatites in the Chinese Altai, revealing their petrogenesis. The pegmatites have three mineralization types, with dominant late Permian ages. They show decoupling spatial-temporal and differentiation-source correlations with Permian granites, indicating no genetic relationship between them. The pegmatites were likely generated by anatexis of metasedimentary rocks under an extensional setting after the arc-arc collision between the Junggar arcs and the Chinese Altai.
Article
Geosciences, Multidisciplinary
Jingyi Deng, Jiankang Li, Dehui Zhang, I-Ming Chou, Qinggao Yan, Xin Xiong
Summary: This study analyzes melt inclusions in granitic pegmatites from a world-class deposit in eastern China, demonstrating that pegmatitic melts may originate from melt-melt immiscibility in granitic magmas. This research is significant for understanding the origin and formation mechanism of pegmatite deposits.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Radoslaw M. Michallik, Thomas Wagner, Tobias Fusswinkel
Summary: The fluid inclusion record of miarolitic gem beryl-bearing Luumaki pegmatite in SE Finland reveals four types of fluid inclusion assemblages, indicating the nature and timing of exsolved fluids in the pegmatite. These inclusions exhibit specific characteristics and relationships, shedding light on the magmatic-hydrothermal origin of the fluids and the conditions of pocket formation.
Article
Geochemistry & Geophysics
Lauren Cooper, Terry Plank, Richard Arculus, Erik Hauri, Katherine A. Kelley
Summary: Analyses of melt inclusions in submarine and subaerial glasses from the Tonga arc provide insights into the volatile contents and melting processes beneath the arc. The study suggests that the boninites in the northern Tonga arc are derived from high degrees of melting in the backarc, rather than from active melting under the arc. The research also reveals the influence of slab processes on the composition of fluids feeding the arc and backarc.
JOURNAL OF PETROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Raphael Gottardi, Ricardo Penaloza, Madison Miller
Summary: This study analyzes outcrops of the Eagle Ford Formation and highlights the importance of hybrid shear fractures as viable migration pathways for hydrocarbon migration in the Austin Chalk-Eagle Ford hybrid petroleum system.
MARINE AND PETROLEUM GEOLOGY
(2023)
Review
Geology
Yan QingGao, Yuan Lulu, Liu YongChao, Li JianKang
Summary: The H2O content in granular melts is crucial for the properties and behavior of the melts. It affects crystallinity, emplacement depth, migration, and enrichment of metal elements in granitic magmas. Various methods, including indirect estimation and direct measurement, have been used to quantify H2O contents in granitic magma. However, these methods have limitations and potential issues. Raman spectroscopy, with its simplicity, in-situ analysis, and nondestructive nature, can accurately determine H2O contents in melt inclusions. Future studies can explore a new method combining Hydrothermal Diamond-anvil Cell and Raman Spectroscopy to in-situ test H2O contents in granitic magma.
ACTA PETROLOGICA SINICA
(2023)
Editorial Material
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Rainer Thomas, Paul Davidson
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(2019)
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Correction
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Rainer Thomas, Paul Davidson, Karen Appel
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Niels Hulsbosch, Rainer Thomas, Marie-Christine Boiron, Stijn Dewaele, Philippe Muchez
CANADIAN MINERALOGIST
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